Table 2: Extraction yields and radical scavenging percentages of several extracts prepared by the extraction procedures E1–E6 from the olive wood sample A.

ExtractaProcedurebSolventTemperatureYieldcRSP ± SDd

A1E1EtOHr.t.54.148.8 ± 0.2

A2E2EtOAcr.t.11.063.2 ± 0.8
A3E2EtOHr.t.51.442.1 ± 0.4

A4E3EtOAcReflux14.264.9 ± 0.1

A5E4EtOAcr.t.8.648.5 ± 0.8
A6E4EtOHr.t.40.042.1 ± 1.1
A7E4EtOH : H2O 3 : 2r.t.111.427.1 ± 1.9
A8E4H2Or.t.80.017.1 ± 1.4
A9E4H2O : HCOOH 4 : 1r.t.122.925.9 ± 0.5
A10E4EtOAcReflux11.450.9 ± 1.5
A11E4EtOHReflux94.352.4 ± 1.7
A12E4EtOH : H2O 3 : 2Reflux145.739.6 ± 1.1
A13E4H2OReflux108.644.0 ± 0.2
A14E4H2O : HCOOH 4 : 1Reflux211.433.7 ± 1.8

A15E5EtOAcReflux22.654.3 ± 0.3
A16E5n-BuOHReflux54.945.7 ± 1.3
A17E5H2OReflux42.011.1 ± 0.8

A18E6Et2OReflux4.048.5 ± 0.1
A19E6CHCl3Reflux4.026.1 ± 0.4
A20E6n-BuOHReflux33.739.6 ± 0.1

Rosemary oleoresin (reference extract)d95.0 ± 0.3

Extracts A1–A20 were prepared from the olive wood sample A, collected in April, 2003 (during the pruning period) at the village of Fuensanta, Jaén province, Spain.
Procedures E1–E6 are detailed in Figures 16.
cYield is expressed as grams of extract per kilogram of olive wood sample.
dRadical scavenging percentage (RSP) is expressed as DPPH scavenging (%). Values are means of three replicates ± SD (standard deviation).
dCommercially available rosemary extract was used as reference, at the same concentration (50  g mL−1).